Improvement in scroll-sawing machines



E. BROWN.

SCROLL-SAWING'MACHINE.

No.174 894. Patented March 21,1876.

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MFHERS. PHOTO-UTHOGRAPHR WASHING") UNITED STATES PATENT QFFIGEO EPHRAIM BROWN, OF LOWELL, MASSACHUSETTS IMPROVEMENT IN SCROLL-SAWING MACHINES.

Specification forming part of Letters Patent No. 174,894, dated March 21, 1876; application filed February 17, 1876.

To all whom it may concern.-

le it known that I, EPHRAIM BROWN, of

I Lowell, in the county of Middlesex and 00mmonwealt'h of Massachusetts, have invented a new and useful Improvement in Scroll-Sawing Machines, which improvement is fully set with in the following specification, reference being had to the accompanying drawing.

The object of my invention is to raise and depress the saw-frame equally at each end thereof, thereby causing said frame to rise and fall vertically, by combining with said name certain guides and two or more levers connected with each other, and by suitable links with'said frame, as hereinafter described.

The accompanying drawing is an oblique elevation.

Upon a vertical standard, A, is supported a'metallic or other stifi' frame, B. To the hangers (J O, on the under side of said frame 13, are pivoted the levers D D, immediately below the saw-frame E. The short arms of the levers D D are connected at their inner r nds by the link F. The same proportion between the long and short arm is preserved in each lever, so that by raising or depressing the long arm of one lever the long arm of the other lever is correspondingly and equally raised or depressed. The outer ends of the said levers are connected by rods G G to the bottom of the saw-frame E. The rod H, by

which the saw is strained, runs through a block, I, secured to the frame A, the block acting as a guide to the saw-frame. Another guide, L, secured to the top of the frame A, embraces the upper arm of the" saw-frame E in a vertical slot.

Motion is communicated to the levers and saw-frame through the pitman M and the crank N on the revolving shaft 0, causing the saw P to reciprocate vertically through the table It.

The levers herein described move both the front and the rear ends of the saw-frame vertically through equal spaces in equal time.

Any number of connected levers, in which the points Where the connecting-rods are attached move through equal spaces in the same direction at the same time, maybe used instead of the two levers D D.

I claim as my invention In combination with the saw-frame E, the guides I L, and two or more levers D D, connected with each other and by suitable links with said saw-frame, as and for the purpose described.

EPHRAIM BROWN.

Witnesses:

ALBERT M. MOORE, GEORGE F. LAw'roN. 

